Getting the Fundamentals Right
Satellite dish work isn’t complicated, but it punishes you for getting lazy in the first hour. I’ve lost count of callbacks where someone slapped a bracket on a crumbly wall or eyeballed the line-of-sight through a tree that was half bare in March. Henrik Lindqvist here. If you want a signal that doesn’t vanish when the wind picks up or the rain starts, you need to think like the dish does—it’s just a focused antenna staring at a dot 35,786 km away. That dot doesn’t move, but everything between you and it does.
Before you drill a single hole, you need three things: a compass you trust, an inclinometer that isn’t your phone, and a satellite finder app with the local azimuth and elevation burned into your brain. The arc is narrow. A twig today is a branch in two years. A clear winter view can become a solid wall of green by June. Plan for the worst season, not the day you’re standing there. And don’t think a smartphone compass is enough—get near a steel flue or a reinforced lintel and you can be 10 degrees off without realising it.
Site Survey and Line-of-Sight Analysis
Walk the property slowly. Find two spots, minimum. The primary mount should stare into the southern sky (up here in the northern hemisphere) at the elevation your location demands. But remember: the dish sees a cone, not a pencil beam. The first Fresnel zone needs to be clear. If anything pokes into that invisible cigar-shaped space, you lose signal. A rough rule I use—crouch behind where the dish face will sit, close one eye, and look toward the satellite’s calculated position. If you see anything but sky, think twice.
Flat roofs and metal cladding nearby are sneaky problems. They bounce the signal, and suddenly your dish sees two copies—one direct, one delayed. That’s multipath, and it turns a strong signal into garbage. The receiver’s built-in meter smooths things out, so it can hide intermittent errors. You want a spectrum analyser on site if you even suspect reflections. A high signal strength with a lousy bit error rate is the fingerprint of multipath. Don’t ignore it.
Mounting and Structural Integrity
A dish is a sail—anyone who’s held an 80cm reflector in a gust knows that. I’ve fixed installs where the bracket was bombproof but the bricks behind it crumbled like shortbread. For a standard 80cm dish in an exposed spot, figure on at least 80 kg of wind force trying to rip it off the wall. Masonry gets M8 or M10 expansion anchors, 70mm deep, no less. Plastic plugs on anything bigger than a 60cm dish? Forget it. Use resin anchors if you want to sleep at night. Timber-framed houses mean finding the studs and running coach screws at least 60mm into the wood. If you can get into the attic and back the bracket with a steel plate, even better.
Get the mast dead vertical. A bubble level works, but a digital inclinometer takes the frustration out. A 1-degree lean and suddenly your elevation scale lies to you—as you swing the dish, the effective angle shifts in a way that’ll have you turning bolts for an hour with nothing to show. Use a T&K bracket system or a sturdy tripod for roof work, and never, ever drill through tiles. Cable routing matters too: drip loops at every entry point, and P-clips every 50cm so the wind doesn’t whip the coax into a fatigue failure.
Cable Routing and Grounding
Coax is boring until it isn’t. Use WF100 or a proper solid-copper-core cable; copper-clad steel has higher DC resistance, and when you’re pushing LNB power and DiSEqC commands down 30 meters, voltage drop starts to matter. Keep runs short—under 30 meters is happy, beyond that think about a line amp or thicker cable. Bend radius? Ten times the cable diameter. A kink is an impedance bump, and that sends a reflection right back to the LNB.
Ground the system properly. Bond the coax screen to the building’s earth at the entry point with a grounding block. It’s not lightning protection—nothing survives a direct hit—but it bleeds off static and gives induced currents a path away from your receiver. If the dish sits high and lonely, run a separate 10mm² earth wire from the mount down to the main rod. Water ingress kills more installs than storms. Self-amalgamating tape on every F-connector, stretched tight and overlapping the cable jacket by 2cm. A dab of silicone grease inside the connector is a good backup, but the tape does the heavy lifting. Rubber boots alone trap condensation—I’ve peeled off too many to count, and the connector underneath was a green, corroded mess.
LNB Selection and Alignment
The LNB is where signals go to get mangled if you cheap out. For fringe areas, 0.1dB noise figure or better. A universal LNB with 9.75/10.6 GHz local oscillators handles most domestic jobs, but if you’re chasing weak feeds from multiple satellites, grab a PLL type. Phase-Locked Loop LNBs drift far less—25 kHz stability versus 1 MHz or worse for standard DRO units. That matters a lot on narrow data carriers and some HD channels. Fewer symbol errors mean fewer glitches.
Skew is the rotation of the LNB in its collar, matching the polarisation angle of the incoming signal. That angle shifts with where you are on the map. A 5-degree error can shave 1-2 dB off your signal-to-noise ratio—the margin between a clean picture and blocky mush when the clouds roll in. Look up the exact skew for your site, set it, then tighten the clamp just enough to hold while you do the fine peaking.
Fine-Tuning the Dish Alignment
Rough alignment gets you a lock. Fine alignment gets you a system that shrugs off a thunderstorm. Use a meter that reads signal quality as a number, not a bouncing bar. Start with elevation—creep through the calculated angle until you hit a peak, then lock those bolts. Then swing the azimuth in tiny arcs. A good peak is sharp: the meter jumps, peaks, and drops. If the peak feels wide and mushy, the dish face might be warped or the LNB isn’t at the true focal point. Measure the distance from dish centre to feedhorn opening; it has to match the f/D spec.
Tighten everything in stages, cross-pattern on the azimuth clamp, and watch the meter after each quarter-turn. The torque alone can nudge you off peak. Once it’s mechanically locked, revisit the LNB skew and chase that last tenth of a decibel. My field rule: if you can’t push signal quality past 70% on a typical receiver under clear skies, go back and re-check the line-of-sight and every connector.
Multi-Satellite and Motorised Setups
A motorised dish opens up the whole arc, but it demands patience. The polar mount has to be aligned to true south and set exactly to your latitude. That’s the axis the motor tracks along. A digital angle finder and a compass adjusted for magnetic declination are non-negotiable. Get it wrong by a degree and the satellites at the far ends of the arc disappear. Also, the latitude scale on the motor bracket isn’t always your actual latitude—read the manual, because the geometry often means a modified setting.
Fixed multi-LNB setups use a multi-feed bracket. The central LNB aims at the bird closest to your due south. The offset LNBs sit to the sides, angled to catch reflections from different orbital slots. On an 80cm dish, you’ll usually pull in satellites up to 6 degrees apart without too much grief. Use slim-feed LNBs designed for the job, or you’ll shadow the main signal. A DiSEqC switch ties them together, but factor in 1-3 dB insertion loss. Mount the switch close to the LNBs, where the signal is still strong after the first amplification stage, so the loss doesn’t bite you later.
Troubleshooting Common Installation Faults
When a fresh install won’t play ball, the answer is usually something basic. No signal? Measure the LNB voltage at the dish. You’re looking for 13V (vertical) or 18V (horizontal), plus a 22 kHz tone for high band. Zero volts means a shorted cable or a dead receiver supply. Swap in a known-good receiver. Intermittent dropouts in wet weather almost always mean water in the cable or a cracked LNB casing. Walk the entire run. Mice love coax jackets—check for teeth marks.
Pixelation on a handful of channels, all on the same transponder, hints at marginal alignment or a branch creeping into the signal path. A spectrum analyser will show you the carrier-to-noise ratio. Below 8 dB for DVB-S2 and you’re hanging by a thread. Re-peak or move the dish. If every channel glitches, suspect the LNB or a badly terminated F-connector. One stray braid strand touching the centre conductor creates an impedance mismatch that can blank entire frequency bands. Re-terminate, and this time, be fussy about it.
Frequently Asked Questions
Q: Can I mount a satellite dish in the loft or attic?
A: You can, if the roof is non-metallic and dry. But even dry timber and tiles will knock 3-10 dB off the signal. That’s the margin you need when it rains. It’s a last resort, maybe for a listed building where outside mounting isn’t allowed. Always test with a meter before you commit.
Q: How important is the dish size for strong wind areas?
A: Big dishes catch big wind. In exposed spots, a smaller, well-designed dish with a good LNB often beats a big flimsy one that twists in a gust. The mount rating matters more than the reflector diameter. A solid 60cm dish on a stout bracket can outlast a 1m mesh dish that flexes and slowly walks off alignment.
Q: Why does my signal drop at certain times of the day?
A: If it’s around the spring or autumn equinox, that’s solar outage—the sun drifts behind the satellite and its noise drowns the signal for a few minutes. Normal, and it only lasts a few days. If it’s a daily thing, a building or landform is probably casting a shadow at that specific sun angle, which tells you the line-of-sight isn’t as clear as you thought.
Q: What’s the best way to waterproof external F-connectors?
A: Self-amalgamating tape, stretched and wrapped from the cable jacket onto the connector body. That’s the only method I’ve seen hold up for years. Adhesive-lined heat-shrink is decent if you can slide it on before the connector goes on. Never trust the rubber boot by itself—it traps moisture. A smear of silicone grease on the threads gives you a second line of defence.
A methodical, physics-first approach is what separates a job you forget about from one that nags you with callbacks. Respect the signal path, bolt the mount like you mean it, and seal every connection. Do that, and the system will hum along for a decade.